i carnt rename files

  jonboy 13:07 19 Jan 03
  jonboy 13:07 19 Jan 03

Please help
When i right click a file (pic) it comes up with a warning if you change this file extension it may become unstable click yes or no, if i click yes it changes the file type please help

  Tog 13:10 19 Jan 03

If you only want to change the name, highlight the letters to the left of the "." the letters to the right is the file extension (3-4 letters) it is warning about.

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